DF-28B Specifications

NOTABLE FEATURES:

Display in Metric or English units to be set at factory.

Choices of flow/volume units:

FLOW	VOLUME
sccm	scc
SLPM	SL
SCMH	SCM
SCFM	SCF

State-of-the-art microprocessor electronics
Flowrate and volume totalizations corrected to STP or actual conditions selectable by the operator.
Bright LED display
Flowrate accuracy ±4% F.S.
Elapsed time meter
RS-232 Communication Port; Operator selectable download frequency for real-time data
Shut-off on time or volume
LED dimming feature
Optional flashcard datalogger for capture and storage of real-time data from RS232 port.

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Model: DF-28B 110V
Model: DF-28BE 220V

GENERAL DESCRIPTION:
The Model DF-28B environmental air sampling system with digital flowmeter is a low volume air sampler consisting of a 1/4 H.P. oil-less carbon vane vacuum pump with a constant air flow regulator for use where a nearly constant air flow is desirable. The regulator holds a constant pressure drop across an in-line orifice by varying the flow through a bypass valve into the pump. This system allows the pump to work at a minimum pressure drop at all times, permitting it to run cooler; thus extending its service life. The oil-less pump requires no lubrication to maintain optimal efficiency during its service life. The pump is mounted on a base plate within a weather resistant aluminum environmental enclosure having four rubber feet. Handles are provided on the enclosure to facilitate transportation. The digital flowmeter has a large bright LED display.

The DF-28B is designed for continuous indoor or outdoor use. This unit can be adapted for tripod mounting if desired. Please consult the product specifications for the design temperature range and the installation category.

The typical operating flow range is 0.5 to 4 CFM (14 – 115 LPM).